Looping on Files

[pschatzmann]

So far it has been easy to loop over memory based streams by just setting setLoop(true). For files, I am relying on the different file implementations that are provided by different libraries. Nevertheless, I decided to provide a new FileLoop or the more generic FileLoopT classes. These classes have quite a few options:

• You can define the loop count
• You can define the total size in bytes to be provided
• You can request to be notified about each rewind

Here is the example sketch that is endlessly playing the same file:

#include <SPI.h> #include <SD.h> #include "AudioTools.h" #include "AudioLibs/AudioKit.h" #include "AudioLibs/FileLoop.h" #include "AudioCodecs/CodecMP3Helix.h" const int chipSelect=PIN_AUDIO_KIT_SD_CARD_CS; AudioKitStream i2s; // final output of decoded stream EncodedAudioStream decoder(&i2s, new MP3DecoderHelix()); // Decoding stream FileLoop loopingFile; StreamCopy copier(decoder, loopingFile); void setup(){ Serial.begin(115200); AudioLogger::instance().begin(Serial, AudioLogger::Info); // setup audiokit before SD! auto config = i2s.defaultConfig(TX_MODE); config.sd_active = true; i2s.begin(config); // setup file SD.begin(chipSelect); loopingFile.setFile(SD.open("/ZZ Top/Unknown Album/Lowrider.mp3")); //loopingFile.setLoopCount(-1); // define loop count //audioFile.setStartPos(44); // restart from pos 44 for wav files //if ((audioFile.size()-44) % 1024!=0) audioFile.setSize((((audioFile.size()-44)/1024)+1)*1024+44); // setup I2S based on sampling rate provided by decoder decoder.begin(); } void loop(){ copier.copy(); }